Good News, well sort of.
Managed to fire it up this morning, again after a battle. and thought I would turn it around in the drive, so instead of the front pointing down to the bottom of the drive (drive has a slight slope, maybe about 1 foot in about 18 foot over all length) to front would be facing up hill to a degree.
Drove it out, just, with hand over snorkle managed to turn it around and drive it back in the drive. got out and noticed some rather pretty multicoloured rainbow patches on the wet drop down drive bit. On closer examination it seems that the Reason there was no petrol in it when I brought it was because it was dumping it on the road when the engine was running, due to the fuel pipe been split at the fuel filter tank side end. Just cut the spilt out and re attached it, new jubilee clip and tried it. Seems alot smoother on tick over, still hesitates but will now accelerate (just) when you plant your foot to the floor over 2500 rpms.
Still dont explain the lack for running on LPG but its a start.